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Posted to issues@commons.apache.org by "Alex D Herbert (JIRA)" <ji...@apache.org> on 2019/04/09 15:39:00 UTC
[jira] [Resolved] (RNG-82) XorShift1024StarPhi generator
[ https://issues.apache.org/jira/browse/RNG-82?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Alex D Herbert resolved RNG-82.
-------------------------------
Resolution: Implemented
In master
> XorShift1024StarPhi generator
> -----------------------------
>
> Key: RNG-82
> URL: https://issues.apache.org/jira/browse/RNG-82
> Project: Commons RNG
> Issue Type: New Feature
> Components: core, simple
> Affects Versions: 1.3
> Reporter: Alex D Herbert
> Assignee: Alex D Herbert
> Priority: Major
> Fix For: 1.3
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> The authors of the algorithm implemented in {{org.apache.commons.rng.core.source64.XorShift1024Star}} have produced a new variant using a different multiplier. The source code is described here:
> [xorshift1024star.c|http://xorshift.di.unimi.it/xorshift1024star.c]
> For clarity the code states:
> {noformat}
> NOTE: as of 2017-10-08, this generator has a different multiplier (a
> fixed-point representation of the golden ratio), which eliminates
> linear dependencies from one of the lowest bits. The previous
> multiplier was 1181783497276652981 (M_8 in the paper). If you need to
> tell apart the two generators, you can refer to this generator as
> xorshift1024φ and to the previous one as xorshift1024*M_8.
> {noformat}
> This can be added as a variant of the current implementation:
> class = XorShift1024StarPhi
> RandomSource = XOR_SHIFT_1024_S_PHI
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